Influence of geometrical parameters of air inlet hole on the kinematic characteristics of jet

Abstract

While considering air exchange scheme in rooms with heat dissipations, it is often preferred when jet flows directly into the working area. It is necessary to take into account the influence of irregularities of velocity profiles in jets that are formed at the outflow from nozzle with different geometry. The jet outflow from inlet holes located beyond elbow was numerically studied. The influence of geometrical parameters of inlet hole on the jet characteristics was investigated.The characteristic flow streamlines for several geometries of a horizontal nozzle, the main characteristics of jet outflow were computed. The relationship between the inlet hole location relative to elbow and the outflow jet characteristics were determined. It was revealed that when the inlet hole is located in close proximity to the elbow, the velocity profiles have strong irregularities, and the jet outflows at an angle to the horizon. When the distance between the hole and the elbow increases, the jet strengthens, the transversal component of velocity does not affect the jet, the outflow angle tends to horizontal.The obtained results can be used for calculating the circulation of air masses in ventilated rooms.